so how exactly do u tune the exhaust to 99db? Loud exhaust don't mean a thing and its not relative to how much power its putting out and I sure as hell wouldn't pay any extra just because its louder. 13-14K If the seller is lucky but being auto and with 100ks on it, he'd have to be very lucky! You would be better off sourcing a more stockish example with lower ks and modding it yourself.